Diphtheria – Serology
Conformément au Règlement de l’Ontario 671/92 de la Loi sur les services en français, les renseignements d’analyses de laboratoire liés à la présente page ne sont offerts qu’en anglais parce qu’ils sont de nature scientifique ou technique et destinés uniquement à l’usage des fournisseurs de soins de santé qualifiés et non aux membres du public.
Testing for Diphtheria is not done for immunity/acute diagnosis/pre-vaccination screening and is only available only for the rare event of an adverse reaction to Diphtheria vaccine or the possibility of humoral immunodeficiency in the patient. This must be indicated on the test requisition in order for testing to be performed.
Whole blood or Serum
5.0 ml blood or 1.0 ml or serum
Blood, clotted - vacutainer tubes (SST)
Submission and Collection Notes
Indicate on the General Test Requisition Form if testing is required due adverse reaction to Diphtheria vaccine, or humoral immunodeficiency in the patient. This must be indicated on the test requisition in order for testing to be performed.
Serum samples should not be heat-inactivated, as this may give false positive results.
The results may be used to aid diagnosis of immunodeficiency. Results must be confirmed by clinical findings and other serological tests.
The results obtained from this assay are not diagnostic proof of protection/immunity against Diphtheria or the presence/absence of immunodeficiency.
Haemolysed, icteric, lipemic or microbially contaminated sera or plasma are not appropriate for testing and will be rejected.
Storage and Transport
Label the specimen container with the patient’s full name, date of collection and one other unique identifier such as the patient’s date of birth or Health Card Number. Failure to provide this information may result in rejection or testing delay.
Instructions for using SST tubes are found in the document titled:LAB-SD-008, Blood Collection Using Serum Separator Tubes.
Test Frequency and Turnaround Time (TAT)
Diphtheria serology testing is performed once per month.
Turnaround time is up to 28 days from receipt by PHO laboratory.
Diphtheria serology testing for Anti-Diphtheria Toxoid IgG is by the Enzyme Immunoassay (EIA) method.
Results are reported to the ordering physician or health care provider as indicated on the requisition.